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Appendix VL

each stroke, but when high-speed engines were introduced it was-
found that it was quite impracticable to supply sufficient cushion
from the steam to meet the then increased forces of reversal.
Two methods were introduced : Willans adopted the air cushion

0O6.   Tfie BeJUUbSS

(H, p. 893) in a separate air cylinder, but Belliss and Morcom
attacked the problem in quite a different manner, which will be
understood from Fig. 1006. The bottom of the crank-shaft
qh^rnber forms an oil tank, in which is placed the little oscillating
A, worked by a rod from the vahre eccentric. Oil is